Assembly method and assembly device

Abstract

The application discloses an assembling method and an assembling device. The assembling method is used for assembling a battery monomer. The battery monomer comprises a shell body and a plurality of series and / or parallel connected cell components accommodated in the shell body. Each cell component comprises an active material coating part and a conductive part. The conductive part is located at one end of the cell component in a first direction and is used for electrically connecting the active material coating part and a pole of the battery monomer. The assembling method comprises the following steps: stacking the plurality of cell components along a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive parts of the plurality of cell components; and placing the plurality of cell components into the shell body. The assembling method of the application is beneficial to simplifying the assembling process of the battery monomer, improving the assembling efficiency, and reducing the occupied area of the plurality of cell components in the assembling process of the battery monomer, thereby reducing the risk of pulling the conductive part in the assembling and transportation process.

Description

Technical Field

[0001] This application relates to the field of battery assembly technology, and in particular to an assembly method and assembly apparatus. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Typically, a battery consists of multiple individual cells, and currently, the assembly process for these individual cells is quite cumbersome and inefficient. Summary of the Invention

[0003] This application proposes an assembly method and assembly apparatus, which helps to simplify the assembly process of battery cells, improve assembly efficiency, and reduce the area occupied by multiple cell components during the assembly of battery cells, thereby reducing the risk of pulling on conductive parts during assembly and transportation.

[0004] In a first aspect, embodiments of this application provide an assembly method for assembling a battery cell. The battery cell includes a housing and a plurality of cell assemblies connected in series and / or in parallel within the housing. Each cell assembly includes an active material coating portion and a conductive portion. The conductive portion is located at one end of the cell assembly in a first direction and is used to electrically connect the active material coating portion and the terminal post of the battery cell. The assembly method includes: stacking the plurality of cell assemblies along a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive portions of the plurality of cell assemblies; and placing the plurality of cell assemblies into the housing.

[0005] In the above technical solution, the electrical connection operation of multiple battery cell components is performed while the multiple battery cell components are stacked along the second direction. This results in a smaller area occupied by the multiple battery cell components during the operation, facilitating their stacking and transport on the logistics line. Furthermore, when the second direction is vertical, the bottommost battery cell component contacts the logistics line, reducing the risk of relative movement between the multiple battery cell components. This effectively reduces the risk of pulling on the conductive parts of the connected components and the risk of cracking during transport on the logistics line, thus improving the reliability of the multiple battery cell components. Moreover, since the electrical connection and casing operations of the multiple battery cell components are performed while they are stacked along the second direction, the relative posture of the multiple battery cell components before and after being placed in the casing is consistent. Therefore, during the assembly of the battery cell, the relative placement posture of the multiple battery cell components before and after casing does not need to be adjusted, simplifying the battery cell assembly process.

[0006] In some embodiments, the battery cell assembly has multiple sidewalls, with the largest sidewall being the first sidewall. Stacking multiple battery cell assemblies along a second direction includes: setting the first sidewalls of two adjacent battery cell assemblies back-to-back and / or opposite to each other along the second direction.

[0007] In the above technical solution, by setting the first sidewalls of two battery cell assemblies back to back and / or opposite to each other along the second direction, the stability of multiple battery cell assemblies stacked along the second direction can be improved, making it easier for multiple battery cell assemblies to be transported on the logistics line while maintaining the above stacked posture, so as to improve production efficiency.

[0008] In some embodiments, electrically connecting the conductive portions of multiple battery cell assemblies includes: converging multiple tabs of the conductive portions of the multiple battery cell assemblies so that the multiple tabs converge at positions close to the active material coating to form a first converged portion and the multiple tabs converge at positions away from the active material coating to form a second converged portion, and pre-connecting the second converged portion.

[0009] In the above technical solution, the tabs of multiple battery cell components are first gathered to form a first gathering part and a second gathering part, so as to shape the multiple tabs. Subsequently, corresponding operations are performed on the first gathering part and the second gathering part to achieve corresponding operations on the multiple tabs, which helps to improve assembly efficiency. At the same time, by pre-connecting the second gathering part, the second gathering part is formed into a whole, thereby reducing the interlayer gap of the multiple tabs in the second gathering part. For example, it is easier to form a plate structure with a certain rigidity of the multiple tabs, so as to facilitate the direct or indirect electrical connection between the second gathering part and the pole, which facilitates subsequent operations.

[0010] In some embodiments, after pre-connecting the second gathering portion and before placing the plurality of battery cell assemblies into the housing, the assembly method further includes: passing the second gathering portion through a clearance hole in the bracket so that at least a portion of the second gathering portion extends to the side of the bracket away from the active material coating portion, and covering the outer periphery of the plurality of battery cell assemblies with the bracket.

[0011] In the above technical solution, by setting a bracket, the second retractable part extends through the clearance hole to the side of the bracket away from the active material coating part, so that the setting of the bracket will not affect the electrical connection between the second retractable part and the corresponding terminal post. At the same time, the bracket can cover the outer peripheral wall of multiple active material coating parts to limit the multiple active material coating parts, which facilitates the subsequent housing operation. The bracket can enter the housing before the active material coating parts, so the bracket can protect the active material coating parts and reduce the risk of the housing scratching the active material coating parts. Meanwhile, the clearance hole on the bracket can limit the second retractable part to a certain extent, so as to improve the stability of the second retractable part and the first retractable part in maintaining their retracted state, and provide a certain support and shaping effect for the conductive part, reducing the risk of cracking of the first retractable part and the second retractable part. It can also separate the active material coating part from the housing, reducing the risk of short circuit between the conductive part and the active material coating part, and improving the reliability of the battery cell.

[0012] In some embodiments, the conductive portion further includes an adapter piece. After the second gathering portion is pre-connected and before the plurality of battery cell assemblies are placed into the housing, the assembly method further includes: fixing the adapter piece to the second gathering portion, and passing the adapter piece and the second gathering portion through a clearance hole on the bracket so that at least a portion of the second gathering portion and the adapter piece extend to the side of the bracket away from the active material coating portion, and covering the outer periphery of the plurality of battery cell assemblies; or, passing the second gathering portion through a clearance hole on the bracket so that at least a portion of the second gathering portion extends to the side of the bracket away from the active material coating portion, and covering the outer periphery of the plurality of battery cell assemblies, and fixing the adapter piece to at least a portion of the second gathering portion.

[0013] In the above technical solution, by setting a bracket, the second retractable part extends through the clearance hole to the side of the bracket away from the active material coating part, so that the bracket setting will not affect the electrical connection between the adapter and the corresponding terminal. At the same time, the bracket can cover the outer peripheral wall of multiple active material coating parts to limit the multiple active material coating parts, which facilitates the subsequent housing operation. The bracket can enter the housing before the active material coating parts, so the bracket can protect the active material coating parts and reduce the risk of the housing scratching the active material coating parts. Meanwhile, the clearance hole on the bracket can limit the second retractable part to a certain extent, so as to improve the stability of the second retractable part and the first retractable part in maintaining their retracted state, and provide a certain support and shaping effect for the conductive part, reducing the risk of cracking of the first retractable part and the second retractable part. It can also separate the active material coating part from the housing, reducing the risk of short circuit between the conductive part and the active material coating part, and improving the reliability of the battery cell.

[0014] In some embodiments, before placing multiple cell assemblies into the housing, the assembly method further includes: wrapping an insulating member around the active material coating portion and connecting the insulating member to a support.

[0015] In the above technical solution, on the one hand, by wrapping the active material coating part with an insulating component, the insulation reliability between the active material coating part and the casing can be improved, reducing or preventing corrosion of the casing caused by contact between the active material coating part and the casing, reducing electrolyte leakage caused by casing corrosion, thereby improving the reliability of the battery cell. On the other hand, by connecting the insulating component with the bracket, the difficulty of fixing the insulating component can be reduced, and the reliability of the insulating component wrapped around the active material coating part can be improved. Furthermore, the insulating component and the bracket can basically wrap multiple battery cell components, which can further reduce the risk of the battery cell components being scratched by the casing during subsequent casing installation, thereby improving the reliability of the battery cell.

[0016] In some embodiments, after placing multiple battery cell assemblies into the housing, the assembly method further includes: fixing a housing cover to the open end of the housing so that the housing cover closes the open end of the housing; and fixing the conductive part to the electrode post.

[0017] In the above technical solution, by fixing the cover to the open end of the casing, multiple battery cell components are enclosed in the cavity defined by the casing and the cover, thereby achieving reliable encapsulation of multiple battery cell components; by fixing the conductive part to the terminal post, the electrical connection between the conductive part and the terminal post is achieved, so as to enable normal charging and discharging of the battery cell.

[0018] In some embodiments, the electrode post is formed with a receiving groove, the opening of the receiving groove is formed on the side surface of the electrode post away from the cell assembly, and a through hole is formed on the groove wall of the receiving groove adjacent to the cell assembly. The assembly method includes: assembling and fixing the electrode post to the housing; and passing a conductive part through the through hole.

[0019] In the above technical solution, the terminal post can be assembled and fixed to the housing first, and then the conductive part can be inserted through the through hole to facilitate the assembly of the housing, terminal post and cell assembly, thereby improving assembly efficiency. Moreover, after inserting the conductive part through the through hole, the conductive part can be fixed to the terminal post, so that a part of the conductive part can be accommodated in the receiving groove. The setting of the receiving groove can reduce the weight of the terminal post, which is conducive to improving the weight energy density of the battery cell. On the other hand, it can accommodate a part of the conductive part, so that the conductive part can be stored and organized through the opening of the receiving groove, and it is also convenient to fix the conductive part to the terminal post through the opening of the receiving groove, thereby reducing the assembly difficulty.

[0020] In some embodiments, after the conductive part is fixedly connected to the pole, the assembly method further includes: fixing a cover plate at the opening of the receiving groove so that the cover plate closes the opening of the receiving groove.

[0021] In the above technical solution, by sealing the opening of the receiving tank with a cover plate, the electrolyte inside the housing can be prevented from leaking out of the opening of the receiving tank; moreover, when the cover plate is electrically connected to the electrode post, it is convenient to use the cover plate to realize the indirect electrical connection between the electrode post and the bus component, which is beneficial to increase the connection area at the electrical connection position and to reduce the resistance at the electrical connection position.

[0022] Secondly, embodiments of this application provide an assembly apparatus for assembling battery cells. Each battery cell includes a casing and multiple cell assemblies connected in series and / or parallel within the casing. Each cell assembly includes an active material coating and a conductive portion. The conductive portion is located at one end of the cell assembly in a first direction and is used to electrically connect the active material coating and the terminal of the battery cell. The assembly apparatus includes: a stacking fixture for stacking multiple cell assemblies along a second direction perpendicular to the first direction; a first fixing fixture for fixing the conductive portions of the multiple cell assemblies; and a casing fitting fixture for placing the multiple cell assemblies into the casing.

[0023] In the above technical solution, multiple battery cell components are stacked along the second direction using a stacking fixture. This reduces the area occupied by the multiple battery cell components during subsequent transportation and operation. When the second direction is vertical, the bottommost battery cell component contacts the logistics line, reducing the risk of relative movement between the multiple battery cell components. This effectively reduces the risk of the conductive parts of the multiple battery cell components being pulled apart and cracked when they are transported on the logistics line after the conductive parts of the multiple battery cell components are electrically connected. This improves the reliability of the multiple battery cell components. Furthermore, during the electrical connection and casing insertion operations, the multiple battery cell components are kept stacked along the second direction. This ensures that the relative posture of the multiple battery cell components is consistent before and after they are placed in the casing. Therefore, during the assembly of the battery cell, the assembly device does not need to adjust the relative placement of the multiple battery cell components before and after they are placed in the casing, simplifying the structure of the assembly device and the assembly process of the battery cell.

[0024] In some embodiments, the assembly apparatus further includes: a gathering fixture for gathering the conductive portions of multiple battery cell assemblies, such that the conductive portions of the multiple battery cell assemblies converge at positions close to the active material coating to form a first gathering portion, and the conductive portions of the multiple battery cell assemblies converge at positions away from the active material coating to form a second gathering portion, and a first fixing fixture for pre-connecting the second gathering portion.

[0025] In the above technical solution, a gathering fixture is used to gather the conductive parts of multiple battery cell components to form a first gathering part and a second gathering part, so as to shape the multiple conductive parts. Subsequent operations on the first gathering part and the second gathering part can achieve corresponding operations on the multiple conductive parts, which helps to improve assembly efficiency. At the same time, the second gathering part is pre-connected by the first fixing fixture, so that the second gathering part is formed into a whole, thereby reducing the interlayer gap of multiple electrode tabs in the second gathering part. For example, it is easier to form a plate structure with a certain rigidity of multiple electrode tabs, which facilitates the direct or indirect electrical connection between the second gathering part and the electrode post, and facilitates subsequent operations.

[0026] In some embodiments, the assembly apparatus further includes: an auxiliary tooling adapted to be detachably connected to the second gathering portion and used to drive the second gathering portion through a clearance hole in the bracket, so that at least a portion of the second gathering portion extends to the side of the bracket away from the active material coating portion.

[0027] In the above technical solution, by setting an auxiliary tooling to drive the second gathering part through the clearance hole on the bracket, it is convenient to assemble the second gathering part with the bracket and to assemble the active material coating part with the bracket. Moreover, the auxiliary tooling is detachably connected to the second gathering part, so after the auxiliary tooling completes the corresponding operation, it can be separated from the second gathering part without affecting subsequent operations.

[0028] In some embodiments, the assembly apparatus further includes: a covering fixture for covering the insulating component outside the active material coating portion; and a second fixing fixture for fixing the insulating component to the bracket.

[0029] In the above technical solution, the insulating component is covered with the active material coating part by setting a covering tool, and the insulating component is fixed to the bracket by a second fixing tool, so as to improve the covering reliability of the insulating component, improve the insulation performance between multiple battery cell components and the casing, thereby improving the reliability of the battery cell; moreover, the insulating component and the bracket can provide a certain degree of protection for multiple battery cell components, reducing the risk of the battery cell components being scratched by the casing during the casing process.

[0030] In some embodiments, the assembly device further includes: a third fixing fixture for fixing the cover to the open end of the housing and for fixing the conductive part to the electrode; and a fourth fixing fixture for assembling and fixing the electrode to the housing.

[0031] In the above technical solution, by setting a third fixture to fix the cover to the body and close the open end of the body, multiple battery cell components are enclosed in the cavity defined by the body and the cover, so as to achieve reliable encapsulation of multiple battery cell components. The third fixture can fix the conductive part to the terminal to achieve electrical connection between the conductive part and the terminal, so as to achieve normal charging and discharging of the battery cell. By setting a fourth fixture to fix the terminal to the body, the assembly of the terminal and the body is achieved.

[0032] In some embodiments, the electrode post is formed with a receiving groove, the opening of the receiving groove is formed on the side surface of the electrode post away from the cell assembly, and a perforation is formed on the groove wall of the receiving groove adjacent to the cell assembly. The assembly device further includes a fifth fixing tool for fixing the cover plate to the opening of the receiving groove.

[0033] In the above technical solution, by setting a fifth fixing fixture to fix the cover plate at the opening of the receiving tank, the cover plate is fixed to the electrode post, so that the cover plate seals the opening of the receiving tank, which can prevent the electrolyte inside the shell from leaking out of the opening of the receiving tank. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0036] Figure 2 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0037] Figure 3 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0038] Figure 4 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0039] Figure 5 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0040] Figure 6 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0041] Figure 7 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0042] Figure 8 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0043] Figure 9A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0044] Figure 10 A schematic flowchart illustrating the assembly method provided in some embodiments of this application;

[0045] Figure 11 A schematic diagram illustrating the assembly process of a battery cell provided in some embodiments of this application;

[0046] Figure 12 Schematic diagrams illustrating two different implementations of multiple battery cell assemblies provided in some embodiments of this application;

[0047] Figure 13 A schematic diagram of an assembly apparatus provided for some embodiments of this application.

[0048] Figure label:

[0049] Battery cell 10, assembly device 100

[0050] 1. Shell body, 2. Cell assembly, 20. First sidewall, 21. Active material coating, 22. Conductive part, 22. Electrode tab, 221. First gathering part, 221a. Second gathering part, 221b. Bracket, 3. Clearance hole, 30. Body, 31. Limiting part, 32. Insulating part, 4. Electrode post, 5. Receiving groove, 50. Perforation, 50a. Shell cover, 6. Cover plate, 7. Stacking fixture, 101. First fixing fixture, 102. Shell insertion fixture, 103. Gathering fixture, 104. Auxiliary fixture, 105. Covering fixture, 106. Second fixing fixture, 107. Third fixing fixture, 108. Fourth fixing fixture, 109. Fifth fixing fixture, 110. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0053] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the various orientations shown in the accompanying drawings of the embodiments of this application are merely illustrative and should not constitute any limitation on this application.

[0056] In this application, "multiple" means two or more (including two).

[0057] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0058] For example, a battery cell may typically include a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The battery cell assembly of the battery cell may be one or more, and each cell assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0059] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0060] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0061] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Typically, a battery consists of multiple individual cells, and currently, the assembly process for these individual cells is quite cumbersome and inefficient.

[0062] In related technologies, a battery cell includes multiple cell components. During the assembly process of a battery cell, these multiple cell components are transported lying flat (e.g., the two large surfaces of each cell component are arranged opposite each other, and the multiple cell components are distributed on a logistics line). Electrical connections are made between the conductive parts of the multiple cell components. This results in a large area occupied by the multiple cell components during the assembly process. Furthermore, during transportation on the logistics line, the relative movement of the multiple cell components may cause the conductive parts connecting them to be easily stretched, leading to cracking of the conductive parts, especially the tabs of the multiple cell components. At the same time, when the multiple cell components are subsequently placed into the housing of the battery cell, it is necessary to change the relative placement of the multiple cell components so that each of the multiple cell components changes from a lying state to a state in which multiple cell components are stacked sequentially, making the assembly process cumbersome.

[0063] Based on the above considerations, in order to simplify the assembly process of battery cells and improve assembly efficiency, this application proposes an assembly method for assembling batteries. The battery cell includes a casing and multiple cell assemblies connected in series and / or in parallel, housed within the casing. Each cell assembly includes an active material coating portion and a conductive portion. The conductive portion is located at one end of the cell assembly in a first direction and is used to electrically connect the active material coating portion and the terminal post of the battery cell. The assembly method includes: stacking multiple cell assemblies along a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive portions of the multiple cell assemblies; and placing the multiple cell assemblies into the casing.

[0064] In the above technical solution, the electrical connection operation of multiple battery cell components is performed while the multiple battery cell components are stacked along the second direction. This results in a smaller area occupied by the multiple battery cell components during the operation, facilitating their stacking and transport on the logistics line. Furthermore, when the second direction is vertical, the bottommost battery cell component contacts the logistics line, reducing the risk of relative movement between the multiple battery cell components. This effectively reduces the risk of pulling on the conductive parts of the connected components and the risk of cracking during transport on the logistics line, thus improving the reliability of the multiple battery cell components. Moreover, since the electrical connection and casing operations of the multiple battery cell components are performed while they are stacked along the second direction, the relative posture of the multiple battery cell components before and after being placed in the casing is consistent. Therefore, during the assembly of the battery cell, the relative placement posture of the multiple battery cell components before and after casing does not need to be adjusted, simplifying the battery cell assembly process.

[0065] Of course, the second direction is not limited to the up and down direction. For example, the second direction can also be the left and right direction, or the front and back direction, etc.

[0066] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of a battery cell 10 provided in some embodiments of this application. The battery cell 10 is cuboid, and the height direction of the battery cell 10 is a first direction X, and the length direction of the battery cell 10 is a third direction Z (i.e., perpendicular to the x-axis). Figure 1 (From the perspective of the paper surface), the thickness direction of the battery cell 10 is the second direction Y. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. However, it is not limited to this. In other embodiments of this application, the battery cell 10 may also be a polygonal prism, a flat body, or other shapes.

[0067] The battery cell 10 may include two cell assemblies 2, which may be arranged sequentially along a first direction. The conductive part 22 of each cell assembly 2 is located at one end of the cell assembly 2 in the first direction. The conductive parts 22 of multiple cell assemblies 2 may be located on the same side of multiple cell assemblies 2 in the first direction. Of course, the battery cell 10 may also include three or more cell assemblies 2.

[0068] Please refer to Figure 1 and Figure 2 , Figure 2 This is a flowchart illustrating the assembly method provided in some embodiments of this application. In the embodiments of this application, the assembly method is used to assemble a battery cell 10. The battery cell 10 includes a casing 1 and multiple cell assemblies 2 housed in the casing 1. The multiple cell assemblies 2 are connected in series and / or in parallel. Thus, the multiple cell assemblies 2 of the battery cell 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple cell assemblies 2 are connected in both series and parallel. Each cell assembly 2 includes an active material coating part 21 and a conductive part 22. The active material coating part 21 is the part of the cell assembly 2 coated with active material, which can assist in the deintercalation and deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive part 22 is located at one end of the cell assembly 2 in a first direction, and the conductive part 22 is used to electrically connect the active material coating part 21 and the terminal post 5 of the battery cell 10. Thus, the conductive part 22 can be a structure that electrically connects the active material coating part 21 and the terminal post 5, and it is not coated with active material.

[0069] It should be noted that, in the embodiments of this application, the active material coating portion 21 is divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with a positive electrode active material layer, and the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with a negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion is electrically connected to the positive electrode active material coating portion and the positive electrode post, and the negative electrode conductive portion is electrically connected to the negative electrode active material coating portion and the negative electrode post.

[0070] In the embodiments of this application, the assembly method includes: stacking multiple battery cell assemblies 2 along a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive parts 22 of the multiple battery cell assemblies 2 to achieve pairing connection of the multiple battery cell assemblies 2; and placing the multiple battery cell assemblies 2 into the housing 1, so that the multiple battery cell assemblies 2 can be placed into the housing 1 in a stacked manner along the second direction.

[0071] As can be seen, in the above technical solution, the electrical connection operation of multiple battery cell components 2 is performed while the multiple battery cell components 2 are stacked along the second direction. Therefore, the area occupied by the multiple battery cell components 2 is small during the operation, facilitating their stacking on the logistics line for transport. Furthermore, when the second direction is vertical, the lowest battery cell component 2 contacts the logistics line, reducing the risk of relative movement between the multiple battery cell components 2. Thus, after the conductive parts 22 of the multiple battery cell components 2 are electrically connected, and while the multiple battery cell components 2 are being transported on the logistics line, the size of the multiple battery cell components can be effectively reduced. The risk of the interconnected conductive parts 22 being pulled is reduced, the risk of the conductive parts 22 cracking is reduced, and the reliability of the multiple cell assemblies 2 is improved. Moreover, during the electrical connection and casing insertion of the multiple cell assemblies 2, the multiple cell assemblies 2 are kept in a stacked state along the second direction for corresponding operations. This makes it easy to ensure that the relative posture of the multiple cell assemblies 2 before and after being placed into the casing 1 is consistent. Therefore, during the assembly of the battery cell 10, the relative placement posture of the multiple cell assemblies 2 before and after being placed into the casing does not need to be adjusted, so as to simplify the assembly process of the battery cell 10.

[0072] Furthermore, since multiple battery cell assemblies 2 are stacked along the second direction in this embodiment, the conductive portions 22 of the multiple battery cell assemblies 2 can be located on the same side of the multiple battery cell assemblies 2 in the first direction, so that the conductive portions 22 of different battery cell assemblies 2 correspond and are electrically connected.

[0073] Please refer to Figure 1 and Figure 11 In some embodiments of this application, the battery cell assembly 2 has multiple sidewalls, and the first sidewall 20 has the largest area among the multiple sidewalls. The first sidewall 20 can be the "large surface" of the battery cell assembly 2.

[0074] Stacking multiple cell assemblies 2 along a second direction includes: setting the first sidewalls 20 of two adjacent cell assemblies 2 back to back and / or opposite to each other along the second direction.

[0075] In the above technical solution, by setting the first sidewalls 20 of the two battery cell components 2 back to back and / or relative to each other along the second direction, the stability of the multiple battery cell components 2 stacked along the second direction is improved, and the multiple battery cell components 2 are convenient to maintain the above stacked posture for transportation on the logistics line, so as to improve production efficiency.

[0076] For example, if a cell assembly 2 includes a first sidewall 20, then the first sidewalls 20 of two adjacent cell assemblies 2 can be arranged opposite to each other or back to back along the second direction to achieve stacking of two adjacent cell assemblies 2 along the second direction; if a cell assembly 2 includes two first sidewalls 20 arranged opposite to each other along the first direction, then one of the first sidewalls 20 of one of the two adjacent cell assemblies 2 can be arranged opposite to one of the first sidewalls 20 of the other cell assembly 2, and the other first sidewall 20 of the aforementioned one cell assembly 2 can be arranged back to back with the other first sidewall 20 of the aforementioned other cell assembly 2.

[0077] Please refer to Figure 3 and Figure 11 In some embodiments of this application, the above-mentioned electrical connection of the conductive portions 22 of the multiple battery cell assemblies 2 includes: converging multiple tabs 221 of the conductive portions 22 of the multiple battery cell assemblies 2 to form a first converged portion 221a at a position close to the active material coating portion 21 (i.e., converging in a direction closer to each other), and converging multiple tabs 221 at a position away from the active material coating portion 21 to form a second converged portion 221b, and pre-connecting the second converged portion 221b to form a connection current path for the tabs 221.

[0078] For example, the active material coating portion 21 may include a current collector and an active material layer disposed on the current collector, and the conductive portion 22 includes a tab portion electrically connected to the current collector. The tab portion includes a plurality of tab pieces 221. The tab pieces 221 are structures that are electrically connected to the current collector but are not coated with active material. For example, the tab pieces 221 can be formed by direct die cutting from the current collector.

[0079] In the above technical solution, the tabs 221 of multiple battery cell components 2 are first gathered to form a first gathering portion 221a and a second gathering portion 221b, so as to achieve the shaping of multiple tabs 221. Subsequently, corresponding operations are performed on the first gathering portion 221a and the second gathering portion 221b to achieve corresponding operations on multiple tabs 221, which is beneficial to improve assembly efficiency. At the same time, by pre-connecting the second gathering portion 221b, the second gathering portion 221b is formed into a whole, thereby reducing the interlayer gap of multiple tabs 221 in the second gathering portion 221b. For example, it is easier to form a plate structure with a certain rigidity of multiple tabs 221, so as to facilitate the direct or indirect electrical connection of the second gathering portion 221b to the pole post 5, which is convenient for subsequent operations.

[0080] Obviously, in the above technical solution, the multiple tabs 221 only converge and move closer together but are not connected when forming the first converged portion 221a and the second converged portion 221b. Then, pre-connecting the second converged portion 221b allows the multiple tabs 221 to be connected into a single structure within the second converged portion 221b. For example, the second converged portion 221b can be pre-connected by welding (e.g., ultrasonic welding) to form a single plate structure; or, the second converged portion 221b can be pre-connected by bonding with conductive adhesive.

[0081] It should be noted that in the above technical solution, along the extension direction of the tab 221, the first gathering part 221a and the second gathering part 221b are arranged sequentially in a direction away from the active material coating part 21. The specific positions of the first gathering part 221a and the second gathering part 221b are not limited. That is, it is not required that the first gathering part 221a is close to the active material coating part 21, nor is it required that the second gathering part 221b is far from the active material coating part 21.

[0082] In this embodiment, the tab 221 can be divided into a positive tab 221 and a negative tab 221. The positive tabs 221 of the multiple battery cell assemblies 2 are gathered and stacked together, and the second gathered portion 221b formed by the multiple positive tabs 221 is pre-connected. Similarly, the negative tabs 221 of the multiple battery cell assemblies 2 are gathered and stacked together, and the second gathered portion 221b formed by the multiple negative tabs 221 is pre-connected.

[0083] It is understood that in the embodiments of this application, the multiple tabs 221 of the conductive parts 22 of the multiple cell components 2 are brought together, and the above operation is still performed in the state of multiple cell components 2 being stacked along the second direction, so that in the above assembly process of the battery cell 10, there is no need to adjust the placement posture of the multiple cell components 2, thus simplifying the assembly process.

[0084] In some embodiments of this application, when there are two battery cell assemblies 2, the tabs 221 of the two battery cell assemblies 2 can be folded together, and the folded position is located at the center position between the two battery cell assemblies 2, so as to form a symmetrical folding form (e.g. Figure 1 and Figure 11 As shown. Alternatively, in some other embodiments, when the tabs 221 of the two cell assemblies 2 are brought together, the brought-up position can be biased towards one of the cell assemblies 2 to form an asymmetrical brought-up form (e.g., Figure 12 (a) and Figure 12 (b) As shown, in the first direction, the projection of the folded position can be located within the projected outer contour of the tabs 221 of the two cell assemblies 2 (e.g., Figure 12(a) shown), or, in the first direction, the projection of the converged position may be located outside the projection outer contour range of the tabs 221 of the two cell assemblies 2 (e.g., Figure 12 (b) is shown.

[0085] Please refer to Figure 4 and Figure 11 In the first embodiment, after the second gathering part 221b is pre-connected and before the multiple battery cell assemblies 2 are placed into the housing 1, the assembly method further includes: passing the second gathering part 221b through the clearance hole 30 on the bracket 3 so that at least a portion of the second gathering part 221b extends to the side of the bracket 3 away from the active material coating part 21, and covering the outer periphery of the multiple battery cell assemblies 2 with the bracket 3 so as to cover the multiple battery cell assemblies 2 into a whole.

[0086] In the above technical solution, by setting the bracket 3, the second gathering part 221b extends through the clearance hole 30 to the side of the bracket 3 away from the active material coating part 21, so that the setting of the bracket 3 will not affect the electrical connection between the second gathering part 221b and the corresponding electrode post 5. At the same time, the bracket 3 can cover the outer peripheral wall of the multiple active material coating parts 21 to play a certain limiting role for the multiple active material coating parts 21. For example, the bracket 3 can restrict the relative movement of multiple battery cell components 2 to a certain extent in the second direction and the third direction, so that the multiple battery cell components 2 are limited by the bracket 3. The components are integrated into a single unit to facilitate subsequent casing installation. Simultaneously, the clearance holes 30 on the bracket 3 can, to some extent, restrict the second retractable portion 221b, thereby improving the stability of the retracted state of the second retractable portion 221b and the first retractable portion 221a. This provides support and shaping for the conductive portion 22, reducing the risk of cracking in the first retractable portion 221a and the second retractable portion 221b. Furthermore, it separates the active material coating portion 21 from the casing 1, reducing the risk of short circuit between the conductive portion 22 and the active material coating portion 21, and improving the reliability of the battery cell 10.

[0087] As can be seen, after multiple battery cell components 2 and bracket 3 are assembled, the assembled multiple battery cell components 2 and bracket 3 are placed together into the housing 1 so that the bracket 3 can be accommodated in the housing 1. At this time, the bracket 3 can be located on the side of the active material coating part 21 that is close to the corresponding terminal 5, and the part of the second gathering part 221b that extends to the side of the bracket 3 away from the active material coating part 21 is convenient for subsequent electrical connection with the corresponding terminal 5, so as to realize normal charging and discharging of the battery cell 10. In the subsequent housing operation, the bracket 3 can enter the housing 1 before the active material coating part 21, so the bracket 3 can play a certain protective role for the active material coating part 21 and reduce the risk of the housing 1 scratching the active material coating part 21. The portion of the second gathering part 221b extending to the side of the support 3 away from the active material coating part 21 can be directly electrically connected to the corresponding pole post 5. Alternatively, the portion of the second gathering part 221b extending to the side of the support 3 away from the active material coating part 21 can be first fixed to the adapter piece, and then the adapter piece can be electrically connected to the corresponding pole post 5 to achieve indirect electrical connection between the second gathering part 221b and the corresponding pole post 5.

[0088] For example, the bracket 3 may include a body portion 31 and a limiting portion 32. The limiting portion 32 is disposed at the edge of the body portion 31 and extends from the body portion 31 along a first direction, so that a mating groove is formed on one side of the bracket 3 in the first direction. A clearance hole 30 is formed on the body portion 31. When multiple battery cell assemblies 2 are assembled with the bracket 3, the side of the bracket 3 with the mating groove faces the multiple battery cell assemblies 2, and the second gathering portion 221b passes through the clearance hole 30. The bracket 3 and the multiple battery cell assemblies 2 approach each other along the first direction until the multiple battery cell assemblies 2 are mated in the mating groove and the limiting portion 32 is located on the outer periphery of the active material coating portion 21, so that the limiting portion 32 is in the second direction and the third direction. The limiting part 32 serves to limit the position of multiple active material coating parts 21, thereby improving the problem of corrosion caused by carbon powder falling off the edge of the active material coating part 21 overlapping with the shell 1. In addition, the setting of the limiting part 32 can also facilitate the connection between the bracket 3 and the insulating part 4 described later, so that multiple battery cell components 2 can be wrapped by the bracket 3 and the insulating part 4, thereby improving the insulation effect. Compared with the prior art method of applying at least 8 layers of insulating adhesive on the front and back of the tab, the embodiment of this application can meet the insulation requirements of the battery cell 10 without applying tab adhesive. At the same time, during the subsequent shell insertion operation, it is easier to further reduce the risk of the battery cell component 2 being scratched by the shell 1, thereby improving the reliability of the battery cell 10.

[0089] The limiting part 32 is connected to the main body part 31. The limiting part 32 can extend from the entire circumferential edge of the main body part 31 to form a ring-shaped extension structure, or it can extend from a part of the circumferential edge of the main body part 31 to form a block-shaped structure protruding relative to the main body part 31. Taking the limiting part 32 as a ring structure as an example, the limiting part 32 can include two first limiting sub-parts arranged opposite each other along the second direction and two second limiting sub-parts arranged opposite each other along the third direction. The two first limiting sub-parts are respectively engaged with the two sides of the multiple active material coating parts 21 in the second direction to restrict the relative movement of the multiple active material coating parts 21 in the second direction. The two second limiting sub-parts are respectively engaged with the two sides of the multiple active material coating parts 21 in the third direction to restrict the relative movement of the multiple active material coating parts 21 in the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0090] In other embodiments of this application, the battery cell 10 may not include the bracket 3. In this case, when multiple battery cell assemblies 2 are inserted into the casing, the bracket 3 is not placed into the casing 1.

[0091] Please refer to Figure 5 In the second embodiment, the conductive part 22 further includes an adapter piece. After the second gathering part 221b is pre-connected and before the multiple battery cell assemblies 2 are placed into the housing 1, the assembly method further includes: fixing the adapter piece to the second gathering part 221b, and passing the adapter piece and the second gathering part 221b through the clearance hole 30 on the bracket 3, so that at least a portion of the second gathering part 221b and the adapter piece extend to the side of the bracket 3 away from the active material coating part 21, and covering the outer periphery of the multiple battery cell assemblies 2 with the bracket 3 so as to cover the multiple battery cell assemblies 2 into a whole.

[0092] In the above technical solution, by setting the bracket 3, the adapter piece and the second gathering part 221b extend through the clearance hole 30 to the side of the bracket 3 away from the active material coating part 21, so that the setting of the bracket 3 will not affect the electrical connection between the adapter piece and the corresponding electrode post 5. At the same time, the bracket 3 can cover the outer peripheral wall of the multiple active material coating parts 21 to play a certain limiting role for the multiple active material coating parts 21. For example, the bracket 3 can restrict the relative movement of multiple battery cell components 2 to a certain extent in the second direction and the third direction, so that the multiple battery cell components 2 are restricted by the bracket 3. As a whole, it facilitates subsequent casing installation; at the same time, the clearance hole 30 on the bracket 3 can, to a certain extent, restrict the second folding part 221b, so as to improve the stability of the second folding part 221b and the first folding part 221a in maintaining their folded state, and provide a certain support and shaping effect for the conductive part 22, reducing the risk of cracking of the first folding part 221a and the second folding part 221b, and can separate the active material coating part 21 from the shell 1, reducing the risk of short circuit connection between the conductive part 22 and the active material coating part 21, and improving the reliability of the battery cell 10.

[0093] As can be seen, after the adapter piece is fixedly connected to the second gathering part 221b and multiple battery cell components 2 and bracket 3 are assembled, they are placed together into the housing 1 so that the bracket 3 is accommodated in the housing 1. The adapter piece can be accommodated in the housing 1, or the adapter piece can be exposed through the hole on the housing 1. At this time, the bracket 3 can be located on the side of the active material coating part 21 close to the corresponding terminal 5. The adapter piece can then be electrically connected to the corresponding terminal 5 to realize the normal charging and discharging of the battery cell 10.

[0094] Optionally, the structure of the support 3 in the second embodiment of this application can be the same as that of the support 3 in the first embodiment, and will not be described again here.

[0095] Please refer to Figure 6 In the third embodiment, the conductive part 22 further includes an adapter piece. After the second gathering part 221b is pre-connected and before the multiple battery cell assemblies 2 are placed into the housing 1, the assembly method further includes: passing the second gathering part 221b through the clearance hole 30 on the bracket 3 so that at least a portion of the second gathering part 221b extends to the side of the bracket 3 away from the active material coating part 21, and covering the outer periphery of the multiple battery cell assemblies 2 with the bracket 3 so that the multiple battery cell assemblies 2 are covered as a whole by the bracket 3, and fixing the adapter piece to the aforementioned at least portion of the second gathering part 221b, wherein the adapter piece is located on the side of the bracket 3 away from the active material coating part 21.

[0096] In the above technical solution, by setting the bracket 3, the second gathering part 221b extends through the clearance hole 30 to the side of the bracket 3 away from the active material coating part 21, so that the setting of the bracket 3 will not affect the subsequent electrical connection between the second gathering part 221b and the adapter piece. At the same time, the bracket 3 can cover the outer peripheral wall of the multiple active material coating parts 21 to play a certain limiting role for the multiple active material coating parts 21. For example, the bracket 3 can limit the relative movement of the multiple battery cell components 2 to a certain extent in the second direction and the third direction, so that the multiple battery cell components 2 are limited by the bracket 3. The components are integrated into a single unit to facilitate subsequent casing installation. Simultaneously, the clearance holes 30 on the bracket 3 can, to some extent, restrict the second retractable portion 221b, thereby improving the stability of the retracted state of the second retractable portion 221b and the first retractable portion 221a. This provides support and shaping for the conductive portion 22, reducing the risk of cracking in the first retractable portion 221a and the second retractable portion 221b. Furthermore, it separates the active material coating portion 21 from the casing 1, reducing the risk of short circuit between the conductive portion 22 and the active material coating portion 21, and improving the reliability of the battery cell 10.

[0097] As can be seen, after assembling multiple battery cell components 2 with the bracket 3, the portion of the second gathering part 221b extending to the side of the bracket 3 away from the active material coating part 21 is fixed with the adapter piece, and then placed together into the housing 1 so that the bracket 3 is accommodated in the housing 1. The adapter piece can be accommodated in the housing 1, or the adapter piece can be exposed through the hole on the housing 1. At this time, the bracket 3 can be located on the side of the active material coating part 21 close to the corresponding terminal 5, and the adapter piece can be electrically connected to the corresponding terminal 5 to realize the normal charging and discharging of the battery cell 10.

[0098] Optionally, the structure of the support 3 in the third embodiment of this application can be the same as that of the support 3 in the first embodiment, and will not be described again here.

[0099] Please refer to Figure 7 and Figure 11 In some embodiments of this application, before placing multiple battery cell assemblies 2 into the housing 1, the assembly method further includes: wrapping an insulating member 4 around the active material coating portion 21 and connecting the insulating member 4 to the bracket 3.

[0100] In the above technical solution, on the one hand, by wrapping the active material coating part 21 with an insulating member 4, the insulation reliability between the active material coating part 21 and the shell 1 can be improved, reducing or preventing the shell 1 from being corroded due to contact between the active material coating part 21 and the shell 1, reducing the leakage of electrolyte caused by the corrosion of the shell 1, thereby improving the reliability of the battery cell 10; on the other hand, by connecting the insulating member 4 with the bracket 3, the difficulty of fixing the insulating member 4 can be reduced, and the reliability of the insulating member 4 wrapped around the active material coating part 21 can be improved; furthermore, the insulating member 4 and the bracket 3 can basically wrap multiple battery cell components 2, which can further reduce the risk of the battery cell components 2 being scratched by the shell 1 during subsequent casing operations, thereby improving the reliability of the battery cell 10.

[0101] It is evident that the bracket 3 and the insulating component 4 can together encompass the outer surface of the battery cell assembly 2 to reduce the risk of the battery cell assembly 2 being damaged by impact.

[0102] It is understood that the operation of wrapping the insulating element 4 and connecting the insulating element 4 to the bracket 3 in the above technical solution can be applied to the first, second and third embodiments described above in this application, respectively.

[0103] For example, the insulating element 4 is an insulating film such as a mylar film, and the insulating element 4 is welded and fixed to the support 3; the support 3 may include a body part 31 and a limiting part 32, the limiting part 32 is fitted to the outer peripheral wall of a plurality of active material coating parts 21, and the insulating element 4 may be welded and fixed to the limiting part 32.

[0104] Please refer to Figure 8 In some embodiments of this application, after placing multiple battery cell assemblies 2 into the housing 1, the assembly method further includes: fixing the housing cover 6 to the open end of the housing 1 so that the housing cover 6 closes the open end of the housing 1; and fixing the conductive part 22 to the electrode post 5.

[0105] In the above technical solution, by fixing the cover 6 to the open end of the body 1, multiple battery cell components 2 are enclosed in the cavity defined by the body 1 and the cover 6, thereby achieving reliable encapsulation of multiple battery cell components 2; by fixing the conductive part 22 to the terminal post 5, the conductive part 22 and the terminal post 5 are electrically connected, so as to achieve normal charging and discharging of the battery cell 10.

[0106] It is understood that, in the first embodiment described above, when the conductive part 22 is fixedly connected to the pole post 5, the portion of the second gathering part 221b extending to the side of the support 3 away from the active material coating part 21 is fixedly connected to the pole post 5; in the second and third embodiments described above, the adapter piece is fixedly connected to the pole post 5.

[0107] It should be noted that the order of "fixing the cover 6 to the open end of the body 1 so that the cover 6 closes the open end of the body 1" and "fixing the conductive part 22 to the terminal 5 so as to realize the electrical connection between the conductive part 22 and the terminal 5" is not specifically limited. For example, after placing multiple battery cell assemblies 2 into the body 1, the cover 6 can be fixed to the open end of the body 1 first, and then the conductive part 22 can be fixed to the terminal 5, or the conductive part 22 can be fixed to the terminal 5 first, and then the cover 6 can be fixed to the open end of the body 1.

[0108] Furthermore, in this embodiment, there are no specific restrictions on the connection method between the cover 6 and the body 1, or the connection method between the conductive part 22 and the pole post 5; for example, the cover 6 and the body 1 are welded together, and the conductive part 22 and the pole post 5 are welded together.

[0109] Please refer to Figure 9 In some embodiments of this application, the electrode post 5 is formed with a receiving groove 50. The opening of the receiving groove 50 is formed on the side surface of the electrode post 5 away from the cell assembly 2, so the receiving groove 50 can be open in the direction away from the active material coating portion 21. A through hole 50a is formed on the groove wall of the receiving groove 50 adjacent to the cell assembly 2, that is, the through hole 50a is formed on the groove wall of the receiving groove 50 away from the opening. The assembly method further includes: assembling and fixing the electrode post 5 to the housing 1; and passing the conductive portion 22 through the through hole 50a.

[0110] In the above technical solution, the terminal 5 can be assembled and fixed to the housing 1 first, and then the conductive part 22 can be inserted through the through hole 50a to facilitate the assembly of the housing 1, the terminal 5 and the cell assembly 2, thereby improving assembly efficiency. Moreover, after inserting the conductive part 22 through the through hole 50a, the conductive part 22 can be fixed to the terminal 5, so that a part of the conductive part 22 can be accommodated in the receiving groove 50. The setting of the receiving groove 50 can reduce the weight of the terminal 5, which is beneficial to improving the weight energy density of the battery cell 10. On the other hand, it can accommodate a part of the conductive part 22, so that the conductive part 22 can be stored and organized through the groove of the receiving groove 50, and the operation of fixing the conductive part 22 to the terminal 5 can be carried out through the groove of the receiving groove 50, thereby reducing the assembly difficulty.

[0111] For example, the electrode post 5 may include an end wall and a side wall, with the end wall located on the side of the side wall near the active material coating portion 21, and the end wall and side wall forming a receiving groove 50, with a through hole 50a formed in the end wall. In this case, the portion of the conductive portion 22 received in the receiving groove 50 can be fixedly connected to the electrode post 5, and the aforementioned portion of the conductive portion 22 can be fixed to the end wall and / or the side wall; or the portion of the conductive portion 22 received in the through hole 50a can be fixedly connected to the electrode post 5.

[0112] It should be noted that the order of "fixing the terminal 5 to the housing 1" and "inserting multiple battery cell assemblies 2 into the housing 1" is not specifically limited. For example, after inserting multiple battery cell assemblies 2 into the housing 1, the terminal 5 is fixed to the housing 1. In this case, the order of "assembling and fixing the terminal 5 to the housing 1" and "fixing the housing cover 6 to the open end of the housing 1" is not specifically limited. However, "assembling and fixing the terminal 5 to the housing 1" can precede "fixing and connecting the conductive part 22 to the terminal 5"; or the terminal 5 can be fixed to the housing 1 first, and then the multiple battery cell assemblies 2 can be inserted into the housing 1.

[0113] In the embodiments of this application, there are no specific restrictions on the method of fixing the electrode post 5 to the housing 1. For example, the electrode post 5 is fixed by riveting to the housing 1. In this case, the electrode post 5 has a first flange and a second flange. The first flange is limited and fitted to the outside of the housing 1, and the second flange is limited and fitted to the inside of the housing 1. Then, the electrode post 5 is fixed to the housing 1 first, and then multiple battery cell assemblies 2 are placed into the housing 1. Of course, the electrode post 5 and the housing 1 can also be fixed by welding.

[0114] Similarly, "passing the conductive part 22 through the through hole 50a" can precede "fixing the conductive part 22 to the terminal 5," and the order of "passing the conductive part 22 through the through hole 50a" and "placing the multiple battery cell assemblies 2 into the housing 1" is not specifically limited. Similarly, the order of "passing the conductive part 22 through the through hole 50a" and "fixing the housing cover 6 to the open end of the housing 1" is not specifically limited. For example, after placing the multiple battery cell assemblies 2 into the housing 1, the conductive part 22 can be passed through the through hole 50a. In this case, the assembly method could include first placing the multiple battery cell assemblies 2 into the housing 1, then assembling and fixing the terminal 5 to the housing 1, and then passing the conductive part 22 through the through hole 50a; or the assembly method could include first assembling and fixing the terminal 5 to the housing 1, then placing the multiple battery cell assemblies 2 into the housing 1, and then passing the conductive part 22 through the through hole 50a; or passing the conductive part 22 through the through hole 50a first. Then, multiple battery cell assemblies 2 are placed into the housing 1. The assembly method may include first assembling and fixing the terminal post 5 to the housing 1, then passing the conductive part 22 through the through hole 50a, and then placing multiple battery cell assemblies 2 into the housing 1; or, during the process of placing multiple battery cell assemblies 2 into the housing 1, the conductive part 22 is passed through the through hole 50a. In this case, the assembly method may include first assembling and fixing the terminal post 5 to the housing 1, and then passing the conductive part 22 through the through hole 50a during the process of placing multiple battery cell assemblies 2 into the housing 1.

[0115] Furthermore, there are no specific restrictions on the order of "fixing the cover 6 to the open end of the housing 1" and all other operation steps following "putting multiple battery cell assemblies 2 into the housing 1".

[0116] Of course, in other embodiments of this application, the groove of the receiving groove 50 can also be formed on the side surface of the pole post 5 facing the cell assembly 2. In this case, the pole post 5 does not need to have a through hole 50a, and the conductive part 22 can be fixed to the pole post 5. For example, a part of the conductive part 22 is stacked on the side of the pole post 5 facing the cell assembly 2, and the above part of the conductive part 22 is welded and fixed to the pole post 5.

[0117] Please refer to Figure 10 and Figure 11 In some embodiments of this application, after the conductive part 22 is fixedly connected to the pole post 5, the assembly method further includes: fixing the cover plate 7 at the opening of the receiving groove 50 so that the cover plate 7 closes the opening of the receiving groove 50.

[0118] In the above technical solution, by sealing the opening of the receiving tank 50 with the cover plate 7, the electrolyte inside the housing 1 can be prevented from leaking out of the opening of the receiving tank 50; moreover, when the cover plate 7 is electrically connected to the electrode 5, it is convenient to use the cover plate 7 to realize the indirect electrical connection between the electrode 5 and the bus component, which is beneficial to increase the connection area at the electrical connection position and to reduce the resistance at the electrical connection position.

[0119] Secondly, embodiments of this application provide an assembly apparatus 100, such as... Figure 13 As shown, the assembly device 100 is used to assemble a battery cell 10. The battery cell 10 includes a casing 1 and multiple cell assemblies 2 housed in the casing 1. The multiple cell assemblies 2 are connected in series and / or in parallel. Thus, the multiple cell assemblies 2 of the battery cell 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple cell assemblies 2 are connected in both series and parallel. Each cell assembly 2 includes an active material coating part 21 and a conductive part 22. The active material coating part 21 is the part of the cell assembly 2 coated with active material, which can assist in the deintercalation and deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive part 22 is located at one end of the cell assembly 2 in the first direction, and the conductive part 22 is used to electrically connect the active material coating part 21 and the terminal post 5 of the battery cell 10. Thus, the conductive part 22 can be a structure that electrically connects the active material coating part 21 and the terminal post 5, and it is not coated with active material.

[0120] The assembly device 100 includes a stacking fixture 101 and a first fixing fixture 102. The stacking fixture 101 is used to stack multiple battery cell assemblies 2 along a second direction, which is perpendicular to the first direction. The first fixing fixture 102 is used to fix the conductive parts 22 of the multiple battery cell assemblies 2 so that the conductive parts 22 of the multiple battery cell assemblies 2 are electrically connected. The assembly device 100 also includes a housing fitting fixture 103, which is used to place the multiple battery cell assemblies 2 into a housing 1.

[0121] In the above technical solution, multiple battery cell assemblies 2 are stacked along the second direction using a stacking fixture 101 to reduce the area occupied by the multiple battery cell assemblies 2 during subsequent transportation and operation. Furthermore, when the second direction is vertical, the lowest battery cell assembly 2 contacts the logistics line, reducing the risk of relative movement between the multiple battery cell assemblies 2. Therefore, after the conductive parts 22 of the multiple battery cell assemblies 2 are electrically connected and when the multiple battery cell assemblies 2 are transported on the logistics line, the risk of the conductive parts 22 connecting the multiple battery cell assemblies 2 being pulled is effectively reduced, thus reducing the risk of the conductive parts 22 being pulled apart. The risk of cracking is reduced, and the reliability of multiple battery cell components 2 is improved. Moreover, during the electrical connection and casing insertion of multiple battery cell components 2, the multiple battery cell components 2 are kept in a stacked state along the second direction for corresponding operations. This makes it easy to ensure that the relative posture of multiple battery cell components 2 is consistent before and after they are placed into the casing 1. Thus, during the assembly process of the battery cell 10, the assembly device 100 does not need to adjust the relative placement posture of multiple battery cell components 2 before and after they are placed into the casing, so as to simplify the structure of the assembly device 100 and simplify the assembly process of the battery cell 10.

[0122] For example, the housing fixture 103 brings multiple battery cell assemblies 2 and housing 1 stacked along the second direction closer together along the second direction, so that multiple battery cell assemblies 2 enter the housing 1 through the open end of the housing 1 until the battery cell assemblies 2 are installed in the housing.

[0123] Optionally, the assembly device 100 in this application embodiment can use the assembly method in the above embodiments of this application to assemble the battery cell 10.

[0124] Please refer to Figure 13 In some embodiments of this application, the assembly device 100 further includes a gathering fixture 104 and a second fixing fixture 107. The gathering fixture 104 is used to gather the conductive parts 22 (e.g., tabs 221) of the multiple battery cell assemblies 2 so that the conductive parts 22 of the multiple battery cell assemblies 2 converge at the position close to the active material coating part 21 to form a first gathering part 221a, and the conductive parts 22 of the multiple battery cell assemblies 2 converge at the position away from the active material coating part 21 to form a second gathering part 221b. The first fixing fixture 102 is used to pre-connect the second gathering part 221b.

[0125] In the above technical solution, by setting a gathering fixture 104 to gather the conductive parts 22 of multiple battery cell assemblies 2 to form a first gathering part 221a and a second gathering part 221b, the multiple conductive parts 22 are shaped. Subsequent operations on the first gathering part 221a and the second gathering part 221b can achieve corresponding operations on the multiple conductive parts 22, which is beneficial to improving assembly efficiency. At the same time, the second gathering part 221b is pre-connected by the first fixing fixture 102, so that the second gathering part 221b is formed into a whole, thereby reducing the interlayer gap of multiple tabs 221 in the second gathering part 221b. For example, it is easier to form a plate structure with a certain rigidity by multiple tabs 221, thereby facilitating the direct or indirect electrical connection between the second gathering part 221b and the pole post 5, which is convenient for subsequent operations.

[0126] Please refer to Figure 13 In some embodiments of this application, the assembly device 100 further includes an auxiliary tooling 105, which is adapted to be detachably connected to the second gathering portion 221b and is used to drive the second gathering portion 221b through the clearance hole 30 on the bracket 3 so that at least a portion of the second gathering portion 221b extends to the side of the bracket 3 away from the active material coating portion 21.

[0127] For example, after the first fixing fixture 102 pre-connects the second gathering part 221b, the auxiliary fixture 105 is connected to the second gathering part 221b. The auxiliary fixture 105 can pass through the clearance hole 30 from the side of the bracket 3 facing the active material coating part 21 to the side of the bracket 3 away from the active material coating part 21, and continue to drive the second gathering part 221b to pass through the clearance hole 30 until at least a part of the second gathering part 221b extends through the clearance hole 30 to the side of the bracket 3 away from the active material coating part 21. Then the auxiliary fixture 105 and the second gathering part 221b are separated.

[0128] In the above technical solution, by setting an auxiliary tooling 105 to drive the second gathering part 221b through the clearance hole 30 on the bracket 3, it is convenient to assemble the second gathering part 221b with the bracket 3 and to assemble the active material coating part 21 with the bracket 3. Moreover, the auxiliary tooling 105 is detachably connected to the second gathering part 221b. After the corresponding operation is completed, the auxiliary tooling 105 can be separated from the second gathering part 221b without affecting subsequent operations.

[0129] In the embodiments of this application, the detachable method between the auxiliary tooling 105 and the second gathering part 221b is not specifically limited.

[0130] In some embodiments, the assembly apparatus 100 further includes an assembly fixture for assembling the support 3 and the active material coating portions 21, so that the support 3 covers the outer periphery of the plurality of active material coating portions 21.

[0131] Please refer to Figure 13 In some embodiments of this application, the assembly device 100 further includes a covering fixture 106 and a second fixing fixture 107. The covering fixture 106 is used to cover the insulating member 4 outside the active material coating portion 21, and the second fixing fixture 107 is used to fix the insulating member 4 to the bracket 3.

[0132] In the above technical solution, the insulating component 4 is covered with the active material coating part 21 by setting the covering tool 106, and the insulating component 4 is fixed with the bracket 3 by the second fixing tool 107, so as to improve the covering reliability of the insulating component 4, improve the insulation performance between the multiple battery cell components 2 and the shell 1, thereby improving the reliability of the battery cell 10; moreover, the insulating component 4 and the bracket 3 can provide a certain degree of protection for the multiple battery cell components 2, reducing the risk of the multiple battery cell components 2 being scratched by the shell 1 during the shell insertion process.

[0133] It is understood that, in the embodiments of this application, if the battery cell 10 includes a support 3, the housing fixture 103 is used to place the assembled multiple battery cell assemblies 2 and the support 3 together into the housing 1. Further, the housing fixture 103 is used to place the assembled multiple battery cell assemblies 2, the support 3, and the insulating component 4 together into the housing 1. If the battery cell 10 does not include a support 3, the housing fixture 103 is used to place the assembled multiple battery cell assemblies 2 together into the housing 1. Further, the insulating component 4 is not fixed to the support 3, and the housing fixture 103 is used to place the assembled multiple battery cell assemblies 2 and the insulating component 4 together into the housing 1.

[0134] Optionally, the second fixed fixture 107 and the first fixed fixture 102 are integrated into one fixture; or the second fixed fixture 107 and the first fixed fixture 102 are respectively constructed as two separately configured fixtures.

[0135] Please refer to Figure 13 In some embodiments of this application, the assembly device 100 further includes a third fixing fixture 108 and a fourth fixing fixture 109. The third fixing fixture 108 is used to fix the cover 6 to the open end of the body 1 and to fix the conductive part 22 to the pole post 5. The fourth fixing fixture 109 is used to assemble and fix the pole post 5 to the body 1.

[0136] In the above technical solution, by setting a third fixture to fix the cover 6 to the body 1 and close the open end of the body 1, multiple battery cell components 2 are enclosed in the receiving cavity defined by the body 1 and the cover 6, so as to realize the reliable encapsulation of multiple battery cell components 2. The third fixing fixture 108 can fix the conductive part 22 to the terminal 5 to realize the electrical connection between the conductive part 22 and the terminal 5, so as to realize the normal charging and discharging of the battery cell 10. By setting a fourth fixing fixture 109 to fix the terminal 5 to the body 1, the assembly of the terminal 5 and the body 1 is realized.

[0137] Optionally, at least two of the first fixed fixture 102, the second fixed fixture 107, the third fixed fixture 108, and the fourth fixed fixture 109 can be integrated into one fixture; or the first fixed fixture 102, the second fixed fixture 107, the third fixed fixture 108, and the fourth fixed fixture 109 can be constructed as four separately configured fixtures.

[0138] Please refer to Figure 13 In some embodiments of this application, the electrode post 5 is formed with a receiving groove 50, the opening of the receiving groove 50 is formed on the side surface of the electrode post 5 away from the cell assembly 2, and a through hole 50a is formed on the groove wall of the receiving groove 50 adjacent to the cell assembly 2. The assembly device 100 also includes a fifth fixing fixture 110, which is used to fix the cover plate 7 at the opening of the receiving groove 50.

[0139] In the above technical solution, by setting the fifth fixing fixture 110 to fix the cover plate 7 at the opening of the receiving tank 50, the cover plate 7 is fixed to the pole post 5, so that the cover plate 7 closes the opening of the receiving tank 50, which can prevent the electrolyte in the shell 1 from leaking out of the opening of the receiving tank 50.

[0140] Optionally, any one of the first fixing fixture 102, the second fixing fixture 107, the third fixing fixture 108, the fourth fixing fixture 109, and the fifth fixing fixture 110 in the embodiments of this application can be a welding fixture (e.g., an ultrasonic welding fixture).

[0141] Optionally, at least two of the first fixed fixture 102, the second fixed fixture 107, the third fixed fixture 108, the fourth fixed fixture 109, and the fifth fixed fixture 110 can be integrated into one fixture; or the first fixed fixture 102, the second fixed fixture 107, the third fixed fixture 108, the fourth fixed fixture 109, and the fifth fixed fixture 110 can be constructed as five separately configured fixtures.

[0142] Please refer to this again. Figure 7 , Figure 10 and Figure 11 This application describes a method for assembling a battery cell 10 according to a specific embodiment.

[0143] In the embodiments of this application, the battery cell 10 includes a casing 1, two cell assemblies 2, a bracket 3, an insulator 4, terminals 5, a casing cover 6, and a cover plate 7. For a single cell assembly 2, the cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The conductive portion 22 is disposed at one end of the active material coating portion 21 in a first direction, and the two side walls of the cell assembly 2 in the second direction are respectively first side walls 20, which are the side walls with the largest area among the multiple side walls of the cell assembly 2. The first direction is a first horizontal direction, the second direction is a vertical direction, and the third direction is a second horizontal direction. The first horizontal direction is perpendicular to the second horizontal direction. The assembly method of the battery cell 10 includes:

[0144] S1. Stack two battery cell assemblies 2 along a second direction, which is perpendicular to the first direction. One of the first sidewalls 20 of one battery cell assembly 2 is arranged opposite to one of the first sidewalls 20 of the other battery cell assembly 2 along the second direction, and the other first sidewall 20 of the aforementioned battery cell assembly 2 is arranged back to back with the other first sidewall 20 of the aforementioned battery cell assembly 2 along the second direction.

[0145] S2. Electrically connecting the conductive parts 22 of the two battery cell assemblies 2 includes: converging multiple tabs 221 of the conductive parts 22 of the two battery cell assemblies 2, so that the multiple tabs 221 are converged near the active material coating part 21 to form a first converged part 221a, and the multiple tabs 221 are converged away from the active material coating part 21 to form a second converged part 221b, and pre-connecting the second converged part 221b.

[0146] S3. The second gathering part 221b is inserted through the clearance hole 30 on the bracket 3 along the first direction, so that at least a portion of the second gathering part 221b extends to the side of the bracket 3 away from the active material coating part 21 in the first direction, and the bracket 3 is covered on both sides of the two battery cell assemblies 2 in the second direction and on both sides of the two battery cell assemblies 2 in the third direction.

[0147] S4. Wrap an insulating component 4 around the active material coating part 21 and connect the insulating component 4 to the support 3.

[0148] S5. Place multiple battery cell assemblies 2 into the housing 1. At this time, the housing 1 has been assembled and fixed with the pole post 5. The conductive part 22 passes through the through hole 50a on the pole post 5.

[0149] S6. Fix the cover 6 to the open end of the body 1 so that the cover 6 closes the open end of the body 1. Fix the conductive part 22 to the pole 5. Fix the cover plate 7 to the slot of the receiving groove 50 to realize the electrical connection between the cover plate 7 and the pole 5. In step S6, the order of fixing the cover 6 to the body 1, fixing the conductive part 22 to the pole 5, and fixing the cover plate 7 to the pole 5 is not specifically limited. Example 1: First fix the cover 6 to the body 1, then fix the conductive part 22 to the pole 5, and then fix the cover plate 7 to the pole 5. Example 2: First fix the conductive part 22 to the pole 5, then fix the cover plate 7 to the pole 5, and then fix the cover 6 to the body 1. Example 3: First fix the cover plate 7 to the pole 5, then fix the conductive part 22 to the pole 5, and then fix the cover 6 to the body 1. Example 4: First fix the cover 6 to the body 1, then fix the cover plate 7 to the pole 5 and the conductive part 22 to the pole 2.

[0150] In the above technical solution, the two battery cell components 2 are always stacked along the second direction throughout the assembly process, which makes it easier to reduce the assembly section layout (i.e., reduce the space occupied by the assembly section layout to reduce the assembly space required during the assembly process) and improve the wire pulling efficiency. Since the posture of the two battery cell components 2 does not need to be adjusted or flipped during the assembly process, the assembly process is simplified and the assembly efficiency is improved. The bracket 3 can provide certain support and limit the conductive part 22, which can save the process of attaching PET film (or polyester film) and welding glue to the conductive part.

[0151] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0152] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An assembly method, characterized in that, For assembling battery cells, the battery cell includes a housing and a plurality of cell assemblies connected in series and / or in parallel, each cell assembly including an active material coating portion and a conductive portion, the cell assembly having a plurality of sidewalls, the largest of which is a first sidewall, the conductive portion being located at one end of the cell assembly in a first direction and used for electrically connecting the active material coating portion and the terminal of the battery cell. The assembly method includes: Multiple battery cell assemblies are stacked along a second direction, which is perpendicular to the first direction. Electrical connections are made to the conductive portions of the multiple battery cell assemblies that are stacked along the second direction; Multiple battery cell assemblies, stacked along the second direction, are placed into the housing. The stacking of the plurality of battery cell assemblies along the second direction includes: The first sidewalls of two adjacent battery cell assemblies are arranged back-to-back and / or opposite to each other along the second direction.

2. The assembly method according to claim 1, characterized in that, The electrical connection of the conductive parts of the plurality of battery cell assemblies includes: Multiple tabs of the conductive parts of the multiple battery cell assemblies are brought together to form a first gathering part near the active material coating part and a second gathering part away from the active material coating part, and the second gathering part is pre-connected.

3. The assembly method according to claim 2, characterized in that, After pre-connecting the second gathering portion and before placing the plurality of battery cell assemblies into the housing, the assembly method further includes: The second gathering portion is passed through the clearance hole on the bracket so that at least a portion of the second gathering portion extends to the side of the bracket away from the active material coating portion, and the bracket covers the outer periphery of the plurality of battery cell assemblies.

4. The assembly method according to claim 2, characterized in that, The conductive part further includes an adapter piece. After the second gathering part is pre-connected and before the plurality of battery cell assemblies are placed into the housing, the assembly method further includes: The adapter piece is fixedly connected to the second gathering portion, and the adapter piece and the second gathering portion are passed through the clearance hole on the bracket, so that at least a portion of the second gathering portion and the adapter piece extend to the side of the bracket away from the active material coating portion, and the bracket is placed over the outer periphery of the plurality of battery cell assemblies; or, The second gathering portion is passed through the clearance hole on the bracket so that at least a portion of the second gathering portion extends to the side of the bracket away from the active material coating portion, and the bracket is covered on the outer periphery of the plurality of battery cell assemblies, and the adapter piece is fixed to the at least portion of the second gathering portion.

5. The assembly method according to claim 3 or 4, characterized in that, Before placing the plurality of said cell assemblies into the housing, the assembly method further includes: An insulating component is wrapped around the active material coating portion, and the insulating component is connected to the support.

6. The assembly method according to any one of claims 1-4, characterized in that, After placing the plurality of said battery cell assemblies into the housing, the assembly method further includes: The cover is fixed to the open end of the shell body so that the cover closes the open end of the shell body; The conductive part is fixedly connected to the pole.

7. The assembly method according to claim 6, characterized in that, The electrode post has a receiving groove, the opening of which is formed on the surface of the electrode post away from the cell assembly, and a through hole is formed on the groove wall adjacent to the cell assembly. The assembly method includes: The pole post is assembled and fixed to the housing; The conductive part is inserted through the through hole.

8. The assembly method according to claim 7, characterized in that, After the conductive part is fixedly connected to the electrode post, the assembly method further includes: The cover plate is fixed to the opening of the receiving groove so that the cover plate closes the opening of the receiving groove.

9. An assembly device, characterized in that, For assembling battery cells, the battery cell includes a housing and a plurality of cell assemblies connected in series and / or in parallel, each cell assembly including an active material coating portion and a conductive portion, the cell assembly having a plurality of sidewalls, the largest of which is a first sidewall, the conductive portion being located at one end of the cell assembly in a first direction and used for electrically connecting the active material coating portion and the terminal of the battery cell. The assembly device includes: A stacking fixture is used to stack multiple battery cell assemblies along a second direction, and to arrange the first sidewalls of two adjacent battery cell assemblies back to back and / or opposite to each other along the second direction, wherein the second direction is perpendicular to the first direction. A first fixing fixture is used to fix the conductive parts of the multiple battery cell assemblies that are stacked along the second direction. A housing fixture for placing multiple battery cell assemblies, which are stacked along the second direction, into the housing.

10. The assembly apparatus according to claim 9, characterized in that, Also includes: A gathering fixture is used to gather the conductive parts of multiple battery cell assemblies so that the conductive parts of multiple battery cell assemblies converge near the active material coating to form a first gathering part, and the conductive parts of multiple battery cell assemblies converge away from the active material coating to form a second gathering part. The first fixing fixture is used to pre-connect the second gathering part.

11. The assembly apparatus according to claim 10, characterized in that, Also includes: An auxiliary tooling is adapted to be detachably connected to the second gathering part and is used to drive the second gathering part through the clearance hole on the bracket so that at least a portion of the second gathering part extends to the side of the bracket away from the active material coating part.

12. The assembly apparatus according to claim 11, characterized in that, Also includes: A coating fixture is used to coat an insulating component over the active material coating portion; The second fixing fixture is used to fix the insulating component to the bracket.

13. The assembly apparatus according to any one of claims 9-12, characterized in that, Also includes: The third fixing fixture is used to fix the cover to the open end of the shell body and to fix the conductive part to the pole. The fourth fixing fixture is used to assemble and fix the pole post to the housing.

14. The assembly apparatus according to claim 13, characterized in that, The electrode post has a receiving groove, the opening of which is formed on the surface of the electrode post away from the cell assembly, and a through hole is formed on the groove wall adjacent to the cell assembly. The assembly device further includes: The fifth fixing fixture is used to fix the cover plate to the opening of the receiving groove.

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